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lib: sbi: sse: allow adding new events

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In order to allow events to be dynamically added, remove the existing
static array of events and use a simply linked list of supported events.
This allows us to move the cb_ops into this list and associated it with
an event_id. Drivers can now register cb_ops before bringing up the sse
core to handle additional events (platform ones for instance).

sbi_sse_init() now allocates as many events as present in the linked
list. Events can now be added with sbi_sse_add_event() which allows to
add new supported events with some callback operations if any. If an
event is not to be supported, then sbi_sse_add_event() should not be
called. This approach currently consider that local events are to be
supported on all harts (ie, they all support the same ISA or
dependencies). If per-hart event availability needs to be supported,
then, an is_supported() callback could be added later and called for
each hart.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
This commit is contained in:
Clément Léger
2025-01-10 14:15:54 +01:00
committed by Anup Patel
parent 147978f312
commit 93f7d819fd
5 changed files with 106 additions and 59 deletions
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4
lib/sbi/sbi_pmu.c
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@@ -1164,9 +1164,9 @@ int sbi_pmu_init(struct sbi_scratch *scratch, bool cold_boot)
return SBI_EINVAL;
total_ctrs = num_hw_ctrs + SBI_PMU_FW_CTR_MAX;
}
sbi_sse_set_cb_ops(SBI_SSE_EVENT_LOCAL_PMU, &pmu_sse_cb_ops);
sbi_sse_add_event(SBI_SSE_EVENT_LOCAL_PMU, &pmu_sse_cb_ops);
}
phs = pmu_get_hart_state_ptr(scratch);
if (!phs) {